ldap_bind: Invalid credentials

Hi:
I configured my slapd.conf file using
suffix "o=MyCompany,c=US"
rootdn "cn=root,o=MyCompany,c=US"
rootpw secret
I also have a file called mycompany.ldif
When I'm trying to run ldapadd
ldapadd -x -D "cn=root,o=MyCompany,c=US" -w "secret" -v -f mycompany.ldif
I got an error
ldap_bind: Invalid credentials
Do you have any suggestion?
Thanks in Advance
Alberto Martin